public class SortTest {
public static void main(String[] args) {
int arr[]={12,4,45,23,5,7,9,33};
System.out.println("数组冒泡排序-------------------------------------------------------------");
for (int i = 0; i < arr.length; i++) {
for (int j = 0; j < arr.length-i-1; j++) {
if(arr[j]//从大到小 大数放在最前位
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1]=temp;
}
}
}
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i] + "\t");
}
System.out.println();
System.out.println();
System.out.println("数组sort排序-------------------------------------------------------------");
Arrays.sort(arr);//默认排序是从小到大
for(int i = 0;i < arr.length;i++)
{
System.out.print(arr[i] + "\t");
}
System.out.println();
System.out.println();
System.out.println("list sort排序-------------------------------------------------------------");
SortTest s = new SortTest();
List list=new ArrayList();
list.add(s.new User(12, "aa"));
list.add(s.new User(35, "cc"));
list.add(s.new User(14, "bb"));
list.add(s.new User(58, "ee"));
list.add(s.new User(38, "dd"));
//方法一:根据Collections.sort重载方法
Collections.sort(list, new Comparator() {
public int compare(User arg0, User arg1) {
return arg0.getAge().compareTo(arg1.getAge()); //当前为升序,调换两个位置就是降序
}
});
//方法二:User对象实现Comparable接口
//Collections.sort(list);
for (int i = 0; i) {
User user=list.get(i);
System.out.println(user.getAge()+"\t"+user.getName());
}
}
public class User implements Comparable{
private Integer age;//比较字段类型必须是Integer
private String name;
public User(){}
public User(Integer age,String name){
this.age=age;
this.name=name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int compareTo(User arg0) {
return this.getAge().compareTo(arg0.getAge());
}
}
}